If you are using an SSD already as the main drive you will gain little by using Smart Response Technology. Smart Response Technology is a poor-mans SSD, so if you can't afford or justify the expense of a good capacity SSD, it's the next cheaper option, but there is little point in having both in my opinion.
I'm not sure if the software/driver for Smart Response Technology would even attempt to cache a non-system hard-drve, and for games the hard-drive isn't usually a bottleneck anyway, and if your games drive is an SSD already, then very little point in having an SSD cache.
Hope that helps.
The focus is to use the SSD soley for the games drive cache. Every day I'm loading the same games and waiting as they churn to open. Benchmarks I've seen online show significant speed ups when caching games, so I believe this is of great potential benefit. But I can't buy enough space for a full game drive, so this SSD cache seems like a good solution. 64 gigs should be enough to store games I commonly play at any one time.